1390727

Information

• Patent Grant
• 1390727

• References
• Source

• Patent Number

  1,390,727

• Date Filed

  Not available

• Date Issued

  Tuesday, September 13, 1921
  103 years ago

• CPC

  • H02M7/533 - using discharge tubes only

• US Classifications

  • 363 - Electric power conversion systems
  • 307 - Electrical transmission or interconnection systems
  • 313 - Electric lamp and discharge devices
  • 315 - Electric lamp and discharge devices: systems